/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package org.apache.jmeter.control.gui;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Box;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

import org.apache.jmeter.control.RunTime;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.util.JMeterUtils;

/**
 * The user interface for a controller which specifies that its subcomponents
 * should be executed some number of seconds in a loop. This component can be
 * used standalone or embedded into some other component.
 * 
 */

public class RunTimeGui extends AbstractControllerGui implements ActionListener {
	/**
	 * A field allowing the user to specify the number of seconds the controller
	 * should loop.
	 */
	private JTextField seconds;

	/**
	 * Boolean indicating whether or not this component should display its name.
	 * If true, this is a standalone component. If false, this component is
	 * intended to be used as a subpanel for another component.
	 */
	private boolean displayName = true;

	/**
	 * Create a new LoopControlPanel as a standalone component.
	 */
	public RunTimeGui() {
		this(true);
	}

	/**
	 * Create a new LoopControlPanel as either a standalone or an embedded
	 * component.
	 * 
	 * @param displayName
	 *            indicates whether or not this component should display its
	 *            name. If true, this is a standalone component. If false, this
	 *            component is intended to be used as a subpanel for another
	 *            component.
	 */
	public RunTimeGui(boolean displayName) {
		this.displayName = displayName;
		init();
		setState(1);
	}

	/**
	 * A newly created component can be initialized with the contents of a Test
	 * Element object by calling this method. The component is responsible for
	 * querying the Test Element object for the relevant information to display
	 * in its GUI.
	 * 
	 * @param element
	 *            the TestElement to configure
	 */
	public void configure(TestElement element) {
		super.configure(element);
		if (element instanceof RunTime) {
			setState(((RunTime) element).getRuntimeString());
		} else {
			setState(1);
		}
	}

	/* Implements JMeterGUIComponent.createTestElement() */
	public TestElement createTestElement() {
		RunTime lc = new RunTime();
		modifyTestElement(lc);
		return lc;
	}

	/* Implements JMeterGUIComponent.modifyTestElement(TestElement) */
	public void modifyTestElement(TestElement lc) {
		configureTestElement(lc);
		if (lc instanceof RunTime) {
			if (seconds.getText().length() > 0) {
				((RunTime) lc).setRuntime(seconds.getText());
			} else {
				((RunTime) lc).setRuntime(0);
			}
		}
	}

    /**
     * Implements JMeterGUIComponent.clearGui
     */
    public void clearGui() {
        super.clearGui();
        
        seconds.setText("1"); // $NON-NLS-1$
    }

	/**
	 * Invoked when an action occurs. This implementation assumes that the
	 * target component is the infinite seconds checkbox.
	 * 
	 * @param event
	 *            the event that has occurred
	 */
	public void actionPerformed(ActionEvent event) {
		seconds.setEnabled(true);
	}

	public String getLabelResource() {
		return "runtime_controller_title"; // $NON-NLS-1$
	}

	/**
	 * Initialize the GUI components and layout for this component.
	 */
	private void init() {
		// The Loop Controller panel can be displayed standalone or inside
		// another panel. For standalone, we want to display the TITLE, NAME,
		// etc. (everything). However, if we want to display it within another
		// panel, we just display the Loop Count fields (not the TITLE and
		// NAME).

		// Standalone
		if (displayName) {
			setLayout(new BorderLayout(0, 5));
			setBorder(makeBorder());
			add(makeTitlePanel(), BorderLayout.NORTH);

			JPanel mainPanel = new JPanel(new BorderLayout());
			mainPanel.add(createLoopCountPanel(), BorderLayout.NORTH);
			add(mainPanel, BorderLayout.CENTER);
		} else {
			// Embedded
			setLayout(new BorderLayout());
			add(createLoopCountPanel(), BorderLayout.NORTH);
		}
	}

	/**
	 * Create a GUI panel containing the components related to the number of
	 * seconds which should be executed.
	 * 
	 * @return a GUI panel containing the loop count components
	 */
	private JPanel createLoopCountPanel() {
		JPanel loopPanel = new JPanel(new BorderLayout(5, 0));

		// SECONDS LABEL
		JLabel secondsLabel = new JLabel(JMeterUtils.getResString("runtime_seconds")); // $NON-NLS-1$
		loopPanel.add(secondsLabel, BorderLayout.WEST);

		JPanel loopSubPanel = new JPanel(new BorderLayout(5, 0));

		// TEXT FIELD
		seconds = new JTextField("1", 5); // $NON-NLS-1$
		secondsLabel.setLabelFor(seconds);
		loopSubPanel.add(seconds, BorderLayout.CENTER);

		loopPanel.add(loopSubPanel, BorderLayout.CENTER);

		loopPanel.add(Box.createHorizontalStrut(secondsLabel.getPreferredSize().width
				+ seconds.getPreferredSize().width), BorderLayout.NORTH);

		return loopPanel;
	}

	/**
	 * Set the number of seconds which should be reflected in the GUI. The
	 * secsCount parameter should contain the String representation of an
	 * integer. This integer will be treated as the number of seconds. If this
	 * integer is less than 0, the number of seconds will be assumed to be
	 * infinity.
	 * 
	 * @param secsCount
	 *            the String representation of the number of seconds
	 */
	private void setState(String secsCount) {
		seconds.setText(secsCount);
		seconds.setEnabled(true);
	}

	/**
	 * Set the number of seconds which should be reflected in the GUI. If the
	 * secsCount is less than 0, the number of seconds will be assumed to be
	 * infinity.
	 * 
	 * @param secsCount
	 *            the number of seconds
	 */
	private void setState(long secsCount) {
		seconds.setEnabled(true);
		seconds.setText("" + secsCount); // $NON-NLS-1$
	}
}
